Graz Advanced School of Science - PHYSICS COLLOQUIUM OF THE UNIVERSITY OF GRAZ AND THE GRAZ UNIVERSITY OF TECHNOLOGY

Vortragender:

o.Univ.-Prof. Dr. Peter ZEPPENFELD

Institute of Experimental Physics, Johannes Kepler University Linz, Austria

Abstract:

I will report on “shedding light on surfaces” in the literal sense, namely, the investigation of

surfaces and thin films using optical reflectance spectroscopy and photo-electron

emission microscopy (PEEM).

I will demonstrate how (conceptually very simple) optical reflectance measurements, can

provide valuable insight into the structure and growth of ultrathin films in straight

correlation with their electronic, optical and other physical or chemical properties.

Notably, optical spectroscopies can achieve sub-monolayer sensitivity and are capable

of monitoring kinetic processes on surfaces in real time. While the spatial resolution in

the UV-VIS range is naturally limited, microscopic information on the structure and

electronic properties can be obtained from photo-emitted electrons in PEEM.

Examples will be presented, in which both methods were used to study the adsorption

and growth of organic molecules on surfaces.

As an outlook, I will describe how optical spectroscopy and PEEM can be combined into a

single experiment, thus enabling truly parallel optical and electron spectroscopy at a

local scale.